PSYCH 1XX3 Lecture Notes - Lecture 2: Assistive Technology, Sexual Selection, Heritability
Document Summary
Adaptations: biological traits that help an individual to survive and reproduce in its habitat. Differential survival and reproduction of organisms as result of the heritable differences between them. Three components: individual differences (variance in traits among pop. , differential reproduction, heritability. Stabilizing selection- selection against any sort of departure from the species typical adaptive design. Natural selection favours not just those who are best at surviving, but also those who are best at reproducing. Darwinian fitness: average reproductive success of a genotype relative to alternative genotypes. Evolution: change in gene frequencies over generations. Sexual selection: the component of natural selection that acts of traits that influence an rganism"s ability to obtain a mate. Differential access to mates (dominate or being chosen by opposite sex) Both traits have negative effect on survival. Tail is energetically expensive to produce, risky to predators, contribute to fitness via increased chance of mating.
